Cannot open bsdesign file after update to 5.6.1

Hi folks,
today I had an update to version 5.6.1. After restarting the app I couldn´t open my project-file again. Also opening the backup files is not possible. What happend?
This is a really big issue for me because I work on a important project.
Can you give me some support?
Kind regards

Sorry that you’ve run into problems! Can you send us the bsdesign file so we can test it at

On the way to you.
Thank you for your support…